Industry Glossary

Industry Glossary

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Term Definition
Halite
Rock salt.
Hangingwall
The rock on the upper side of a vein or ore deposit.
Haulage
The horizontal transport of ore, coal, supplies, and waste. The vertical transport of the same is called hoisting.
Haulageway
Any underground entry or passageway that is designed for transport of mined material, personnel, or equipment, usually by the installation of track or belt conveyor.
Head grade
The average grade of ore fed into a mill.
Head section
A term used in both belt and chain conveyor work to designate that portion of the conveyor used for discharging material.
Headframe
The structure surmounting the shaft which supports the hoist rope pulley, and often the hoist itself.
Heading
A vein above a drift. An interior level or airway driven in a mine. In longwall workings, a narrow passage driven upward from a gangway in starting a working in order to give a loose end.
Heap leaching
A process whereby valuable metals, usually gold and silver, are leached from a heap, or pad, of crushed ore by leaching solutions percolating down through the heap and collected from a sloping, impermeable liner below the pad.
Heaving
Applied to the rising of the bottom after removal of the coal; a sharp rise in the floor is called a hogsback.
Hedging
Taking a buy or sell position in a futures market opposite to a position held in the cash market to minimize the risk of financial loss from an adverse price change.
Hematite
An oxide of iron, and one of that metal's most common ore minerals.
High grade
Rich ore. As a verb, it refers to selective mining of the best ore in a deposit.
High-grader
One who steals rich ore, especially gold, from a mine.
Highwall
The unexcavated face of exposed overburden and coal in a surface mine or in a face or bank on the uphill side of a contour mine excavation.
Highwall miner
A highwall mining system consists of a remotely controlled continuous miner which extracts coal and conveys it via augers, belt or chain conveyors to the outside. The cut is typically a rectangular, horizontal cut from a highwall bench, reaching depths of several hundred feet or deeper.
Hogsback
A sharp rise in the floor of a seam.
Hoist
A drum on which hoisting rope is wound in the engine house, as the cage or skip is raised in the hoisting shaft.
Hoist
The machine used for raising and lowering the cage or other conveyance in a shaft.
Hoisting
The vertical transport coal or material.

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